·Generally made of steel stamping or brass cage and some of them are using cage of formed polyamide

·Double roller: NN, NNU, NNF series

·Double roller bearing

·They are separable, which means ring with complete flange, roller and cage can be installed with other rings, or all the bearing components can be installed separately, which is favorable for stalling, checking and maintaining

·Four roller: FC, FCD series

·Four row cylindrical roller bearings are almost used for roller neck of mill housing, rollers and rolling machines

·Compared with other roller bearing, these bearing are characterized by low friction

·They are always interference fitted on roll necks especially application to rolling machines which rolling at a high speed